PC Shutting off completely during games

Hello everybody,
I am currently experiencing an issue whenever I load Call of Duty: Ghosts and Battlefield 4. My PC shuts off completely as if the power cable has been unplugged. No BSOD, No strange audio, and No graphics fragmenting. With CoD it happens within 2 or 3 minutes of the game launching to the menus (not even playing the game yet) but with BF4 it happens 45mins to an hour after playing. Every other game but these run flawlessly without problems. I've made sure that my drivers are up to date, and I've updated the bios to the current beta release and then back to the newest stable release but I am still experiencing this issue. Now i had a feeling it was a power issue because I have seen other posts about this issue as well. Also the previous PSU I had installed was very weak. ( http:// ) so i upgraded it to a 735w ( http:// ) and no difference. These are the only two games i am experiencing this with and my temps seem to be alright. So any help or answers would be greatly appreciated.

Here are my PC specs and also I am not overclocking anything.

Mainboard : Gigabyte GA-990FXA-UD3 (Rev 1.1)
Chipset : ATI RD9x0
Processor : AMD FX 8120 @ 3100 MHz (max : 4020)
Physical Memory : 8192 MB
Video Card : AMD Radeon HD 6570
Hard Disk : Seagate ST31000528AS ATA Device (1000GB)
DVD-Rom Drive : Optiarc DVD+-RW AD-7200S
Monitor Type : Acer Acer S231HL - 23 inches
Network Card : Realtek Semiconductor RTL8168/8111 PCIe Gigabit Ethernet Adapter
Operating System : Windows 7 Ultimate Professional Media Center 6.01.7600 (64-bit)
DirectX : Version 11.00

Thanks again guys.

EDIT//: Just looked at temps and CPU is running around 60 celsius when cod is running and the gpu is running around 35-40 Celsius.
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    This previous thread seems relevant as a possiblity.

    The outside fan idea isn't a bad choice, if your Fan is cutting out for just a few seconds for w/e reason it would shut down and the temp wouldn't register I would think.

    EDIT: The only other time I experienced a similar issue was with a conflict with my antivirus software. But, that would, typically, give you a BSOD at least, but not always.
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